Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 365/80-20 | 42/14-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 42.99 (1092) | 42.14 (1070.48) | -0.85 (-21.52) -2% |
| Width inches (mm) | 14.37 (365) | 14.02 (356) | -0.35 (-9) -2.5% |
| Circum. inches (mm) | 135.06 (3430.62) | 132.4 (3363.01) | -2.66 (-67.61) -2% |
| Sidewall Height inches (mm) | 11.5 (292) | 11.07 (281.24) | -0.42 (-10.76) -3.7% |
| Revolutions per mile (km) | 469.11 (291.49) | 478.54 (297.35) | 9.43 (5.86) 2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.61 mph (31.55 km/h) |
| 25 mph (40.23 km/h) | 24.51 mph (39.44 km/h) |
| 30 mph (48.28 km/h) | 29.41 mph (47.33 km/h) |
| 35 mph (56.33 km/h) | 34.31 mph (55.22 km/h) |
| 40 mph (64.37 km/h) | 39.21 mph (63.11 km/h) |
| 45 mph (72.42 km/h) | 44.11 mph (70.99 km/h) |
| 50 mph (80.47 km/h) | 49.01 mph (78.88 km/h) |
| 55 mph (88.51 km/h) | 53.92 mph (86.77 km/h) |
| 60 mph (96.56 km/h) | 58.82 mph (94.66 km/h) |
| 65 mph (104.61 km/h) | 63.72 mph (102.55 km/h) |
| 70 mph (112.65 km/h) | 68.62 mph (110.43 km/h) |
| 75 mph (120.7 km/h) | 73.52 mph (118.32 km/h) |
| 80 mph (128.75 km/h) | 78.42 mph (126.21 km/h) |
| 85 mph (136.79 km/h) | 83.32 mph (134.1 km/h) |
| 90 mph (144.84 km/h) | 88.23 mph (141.99 km/h) |
| 95 mph (152.89 km/h) | 93.13 mph (149.88 km/h) |
| 100 mph (160.93 km/h) | 98.03 mph (157.76 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1218 | 1415 | 1524 | 1591 | 1663 | 1715 | 1772 | 1840 | 1933 | 2026 | 2130 | 2213 | 2363 | 2529 | 2658 | 2741 | 2788 | 2959 | 3197 | 3716 |
Better Fuel Economy Factory Ratios Increased Power
